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A Mahle plain piston ring set specified for Napier THM-13 applications, listed with sizing of 3.937 in bore and 1.2 mm ring thickness plus .135 in ring width. This set is offered as a direct replacement ring kit matching the dimensions shown, useful when restoring ring-to-bore specification or during an engine rebuild where these exact measurements are required.
Mahle Rings Performance Napier THM-13 3.937 x 1.2MM .135inRW Plain Ring Set
